The more I (sorta) learn another language, the more am I amazed at how many concepts, words, phrases, expressions etc. in one language don't (in my opinion) have a proper translation into the other language.

For example:In English: lonely

I don't feel that there is really a good way in French to translate this concept. Using the French-English dictionaries, I get"I feel alone today""I am isolated""I am sad"

Well, I can be alone or isolated without feeling lonely. I can be lonely and sad, but sad isn't necessarily lonely, and lonely isn't necessarily sad.

Other translations given are: solitary, suffering from solitudness, desolate, and rarely frequented.